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This is a 1918 Parker “Black Giant” eyedropper-filler in Black Hard Rubber. Parker’s first “Giant,” the “Red Giant,” introduced in 1909 at $10, failed because the cap was too brittle and Parker was losing too much money honoring their warrantees. This was less of a problem with the “Black Giant,” introduced soon afterwards. These are found clipless, with a “split” clip (open in the back), and a full washer clip (such as this model. They also …